hi, i need to extract some information from my protXML files, but
there are some fields whose meaning is not clear to me.....

         <peptide peptide_sequence="IITHPNFNGNTLDNDIMLIK" charge="3"
initial_probability="0.9990" nsp_adjusted_probability="0.9992"
peptide_group_designator="b" weight="1.00"
is_nondegenerate_evidence="Y" n_enzymatic_termini="2"
n_sibling_peptides="14.75" n_sibling_peptides_bin="4" n_instances="21"
exp_tot_instances="19.98" is_contributing_evidence="Y"
calc_neutral_pep_mass="2282.1727">


  here what exactly 'n_instances' mean? to me it seems to be total #
of spectra corresponding to the peptide.. am i right? plz help me!


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